Unveiling the Excited‐State Dynamics of Mn<sup>2+</sup> in 0D Cs<sub>4</sub>PbCl<sub>6</sub> Perovskite Nanocrystals
Wen Zhang, Jiaojiao Wei, Zhongliang Gong, Ping Huang, Jin Xu, Renfu Li, Shaohua Yu, Xingwen Cheng, Wei Zheng, Xueyuan Chen
Abstract
Abstract Doping is an effective strategy for tailoring the optical properties of 0D Cs 4 PbX 6 (X = Cl, Br, and I) perovskite nanocrystals (NCs) and expanding their applications. Herein, a unique approach is reported for the controlled synthesis of pure‐phase Mn 2+ ‐doped Cs 4 PbCl 6 perovskite NCs and the excited‐state dynamics of Mn 2+ is unveiled through temperature‐dependent steady‐state and transient photoluminescence (PL) spectroscopy. Because of the spatially confined 0D structure of Cs 4 PbCl 6 perovskite, the NCs exhibit drastically different PL properties of Mn 2+ in comparison with their 3D CsPbCl 3 analogues, including significantly improved PL quantum yield in solid form (25.8%), unusually long PL lifetime (26.2 ms), large exciton binding energy, strong electron–phonon coupling strength, and an anomalous temperature evolution of Mn 2+ ‐PL decay from a dominant slow decay (in tens of ms scale) at 300 K to a fast decay (in 1 ms scale) at 10 K. These findings provide fundamental insights into the excited‐state dynamics of Mn 2+ in 0D Cs 4 PbCl 6 NCs, thus laying a foundation for future design of 0D perovskite NCs through metal ion doping toward versatile applications.